Mainly to outline the muscles and make them look smooth
Recommendations:
Put at 0.50 or less or it'll be super weird
Specify how many people (1boy, solo, male focus)
If want texture on the skin do add (scarred skin, subtle hair on XXX)
Positive Prompt
1boy, male focus, masterpiece, best quality, absurdres, newest, perfect quality, best quality, detailed background, intricate details, detailed face, bara
Negative Prompt
Low quality, worst quality, normal quality, text, signature, jpeg artifacts, bad anatomy, old, early, copyright name, watermark, artist name, username, bad hands, monochrome, female, chest hair, not following prompt, multiple people